[Bug 1333921] [NEW] Software updater spontaneously pops up request for bug report

[Quigi]

Public bug reported:

Running Trusty Tahr (14.04 LTS), after one of update-manager's periodic runs, it (or Apport?) popped up a dialog window.
Name: "Software Updater"
Title: "Could not initialize the package information"
Message:
   An unresolvable problem occurred while initializing the package information.
   
   Please report this bug against the 'update-manager' package and include the following error message:
   E:Opening /etc/apt/sources.list.d/canonical.list - ifstream::ifstream (13: Permission denied)

======
Herewith reported.

The file exists, but is not readable by other:
   -rw-rw---- 1 root root 59 Jun 24 08:05 /etc/apt/sources.list.d/canonical.list

This is not a distribution or release upgrade; /var/log/dist-upgrade/ is
empty.

The issue seems to confuse Apport; I tried "ubuntu-bug update-manager" and "ubuntu-bug -w", but both pop up this message:
   The problem cannot be reported:
   
   E:Opening /etc/apt/sources.list.d/canonical.list - ifstream::ifstream (13: Permission denied)"

Maybe that file should be world readable for the benefit of ubuntu-bug?
Initially update-manager had asked for my password in order to make
changes to the system (and I have sudo).

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1333921

Title:
  Software updater spontaneously pops up request for bug report

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  Running Trusty Tahr (14.04 LTS), after one of update-manager's periodic runs, it (or Apport?) popped up a dialog window.
  Name: "Software Updater"
  Title: "Could not initialize the package information"
  Message:
     An unresolvable problem occurred while initializing the package information.
     
     Please report this bug against the 'update-manager' package and include the following error message:
     E:Opening /etc/apt/sources.list.d/canonical.list - ifstream::ifstream (13: Permission denied)

  ======
  Herewith reported.

  The file exists, but is not readable by other:
     -rw-rw---- 1 root root 59 Jun 24 08:05 /etc/apt/sources.list.d/canonical.list

  This is not a distribution or release upgrade; /var/log/dist-upgrade/
  is empty.

  The issue seems to confuse Apport; I tried "ubuntu-bug update-manager" and "ubuntu-bug -w", but both pop up this message:
     The problem cannot be reported:
     
     E:Opening /etc/apt/sources.list.d/canonical.list - ifstream::ifstream (13: Permission denied)"

  Maybe that file should be world readable for the benefit of ubuntu-
  bug?  Initially update-manager had asked for my password in order to
  make changes to the system (and I have sudo).

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